Telephone receiver



May 5 1925. 1,536,482

F. DIETRICH ET AL TELEPHONE RECEI VER iled June 13. 1922 iwww IN V EN TORJ' ATTORNE YJ telephone receivers, such as Fctenied May s, was.

' UNITED STATES -rrc.

FREDERICK hxmmon,

ASSIGNOBS r0 0. BBANDES,

OF BUSHING, AHD EDWARD BEE/GEAR, OF NEW YQBK, K. Y.,

DIG,

A CORPORATION OF NEW YORK.

summons RECEIVER.

Application filed June 13,

7 '0 all whom it may concern:

.Be it known that we, Fnnonnrcn DIE- rnron, a citizen of the United States, residing at Flushing, in the county of Queens and State of New York, and EDWARD BERG- uAN, a citizen'of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Telephone Receivers; and we do hereby dcclare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

T his invention relates, in general to electro-magnetic devices and is directed more particularly to improvements in telephone receiver construction.

It has for its objects, first: a simplification in the process of manufacture of telephone receivers to effect a reduction in cost, and, second: an improvement in telephone receivers from the standpoint of durability, or to he more specific, the provision of a receiver which may be taken apart without any likelihood of breaking the winding leads.

"The electro-xnagnets of high resistance are ordinarily employed for receiving wireless signals and the like, are wound with extremely fine wire which is easily broken. These electro-magnets, as is well known, ordinarily consist of two windings each on a separate core or pole-piece and it has been the practice, heretofore, to solder relatively heavy wire leads to the ends of the fine wire windings and to bring these leads to the outside of the windings. A pair of these leads, one from each winding, were then twisted together and soldered, usually after the magnets were as sembled in the receiver casing. Vfith such a construction it is necessary, as will be evident, that one of the heavy wire leads be first soldered to one end of the line wire after which the coil is wound and then a second heavy wire lead is soldered to the outside end of the winding and tied around the coil. This process is, obviously, slow 7 and the output of each winding operator is correspondingly small. Furthermore, with such a construction disassembling the receiver is a rather delicate undertaking because of the possibility of breaking the leads connecting the two coils together. This lat- 1922. Serial No. 567,928. 7

ter factor constitutes a real objection to the old type of construct-ion because the leads, while relatively large as compared with the wire of the winding, are, in reality, of rather fine wire and will not stand much abuse.

In receivers constructed in accordance with this invention the wire leads previously referred to may be eliminated and to this end a specially designed spool head is preterably employed for each magnet winding to each of which spool heads a pair of soldering terminals is secured. These torminals are so disposed that in the assentbled receiver two of them (one for each winding) are positioned adjacently and soldered together.

In winding the coils the operator has only to twist the starting), end of the tine wire around one of the terminals, or secure it to the winding chuck, proceed with the winding operation and then twist the final. end of the wire around the other terminal. The coils as thus wound are then passed along to another workman who solders the ends of the windings to the terminals. lVhen the coils are assembled in the receiver the previously mentioned adjacent terminals are joined by merely touching them with a hot soldering iron, there being no wire leads to be twisted together and soldered.

A special feature of the invention relates to the method of fastening the soldering terminals to the spool-head. A.ccordlng to this feature, a slot having an enlarged portion extends from the edge of the spool-head and the terminal is placed in this slot and pressed to conform to the slot and enlarged portion thereof so that it is firmly anchored in place. This feature of the invention is not limited in its utility to any particular type of apparatus, such as tcleg'ihonc ceivers, but may be employed to good advantage in other electrical devices, as for example relays.

Referring now to drawing:

Fig. 1 is a plan view of a telephone receiver in accordance with this invention, the receiver cap and diaphragm being removed in order to disclose t e interior parts.

Fig. 2 is a plan view of one unit of an clcctronnagnet.

Fig. 3 is a view in elevation of the unit shown in the accompanying Fig. 2.

' the slots provided therefor, andthe latter in I view illustrating the manner in which the soldering terminals are secured to the spoolhead.

Fig. 6 is an enlarged view ofa pair of electromagnct-' units showing the adjacent terminals soldered together, and

Fig. 7 is an illustrationpf an old type of receiver construction.

The complete receiver comprises the casing 1, a cap and diaphragm of usual construction which are not here shown, a permanent magnet 2 of annular form which is secured within the casing 1, and a pair of electro-magnet units, each of which comprises a fpole-piece or core 4, a pair of vulcanized bre spool-heads 5 and 6 to each of which is secured a pair of terminals 7, and a winding 8 of very fine insulated wire.

Figures 2 and 3 clearly illustrate how the spool-heads are mounted on the pole-piece 4 to form a bobbin for the winding 8. The spool-head 5 is provided at each end portion with a slot 5 having an enlarged portion 5 The soldering terminals 7 which may be of round copper wire, or square rod, if desired, are inserted in the slots as shown in Fig. 4, the slots bein preferably made of a width to loosely fit the terminals. The spool-heads with the terminals inscrtcd, as in Fig. 5,'are put in a press having a tool adapted to flatten out the portions of the terminals within the slots to such an extent as to cause them to firmly engage the sides thereof and the terminals are thereby securely anchored to the spool-head.

As shown in Fig. 6 each end of each windin is twisted around one of the terminals and soldered thereto, and after the electro-magnet units are assembled in the casing as shown in Fig. 1, the ends of the adjacent terminals 7 are soldered together as shown at 10. The leads 11 may be soldered to the terminals 12 which extend through the casing 1, to binding posts positioned on the back thereof.

Figure 7 shows the familiar old type con struction in which loads 13 are twisted to gether and soldered. I

It is obvious that the construction described, and hereinafter claimed, is applicable for use in many electrical devices of said. cores, a pair of adjacent soldering terminals each of which is mounted on one of said terminal supporting members and a pair of windings one on each of said cores, one end of each of said windings being connected to its respectively associated one of said soldering terminals said soldering terminals being in electrical engagement one with the other. t

2. In an electro-magnet, a pair of adjacent magnet cores, a pair of terminal supporting members 1 Lach being mounted on one ot' said cores, a pair of adjacen soldering terminals each of which i" mounted on one of said terminal supporting, members and a pair of windings one on each of said cores, one end of each of said windings being connected to its respectively associated one of said soldering terminals, said soldering ter;

initials being soldered together.

3. In an clectro-magnet, a pair of adjacent magnet cores, a pair of spool-heads one being elongated with respect to the other and each mounted on one of said cores respectively, a pair of adjacent terminals cachbeing mounted on one of said elongated spool-heads respectively, a pair of magnot windings one on each of said cores, one end of each of said windings being connected to its respectivelyassociated one ofsaid terminals, said terminals being soldered togcther.

4. In a telephone receiver, a pair of magnet windings, a pair of terminal supporting members, and a pair .of terminals each secured to one of said terminal supporting members respectively, one end of each of said windings being secured to one of said terminals, said terminals being soldered together.

\ In testimony whereof we aflix our signa ltures.

FREDERICK DIETRICH. EDWARD BERGMAN. 

